Radio knob



FIG. 1 is a top, front, and first side perspective view of a radio knob, shown with the radio knob in a stowed position;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a first side elevation view thereof;

FIG. 5 is a second side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a top, rear, and second side perspective view thereof;

FIG. 9 is a top, front, and first side perspective view thereof, shown with the radio knob in an extended position;

FIG. 10 is a front elevation view thereof;

FIG. 11 is a rear elevation view thereof;

FIG. 12 is a first side elevation view thereof;

FIG. 13 is a second side elevation view thereof;

FIG. 14 is a top plan view thereof;

FIG. 15 is a bottom plan view thereof; and,

FIG. 16 is a top, rear, and second side perspective view thereof.

The broken lines showing a radio and handle in FIGS. 1-16 represent environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a radio knob, as shown and described. 